10
+2
1
+1
2
+7
10
+4
2
+3
3
+1
5
+1
1
+4
5
+4
8
+1
6
+1
5
+2
4
+3
2
+4
1
+8
3
+6
6
+2
10
+5
10
+8
10
+6
Practice addition facts with free printable worksheets. Uniquely generated — reinforce key math skills with every set.
Frequently Asked Questions
How do I use this Addition Facts Hard Worksheets worksheet?
Print the worksheet and complete the problems. Each set number generates a unique arrangement. Use the same set number for all students in a class for consistent assessment.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen.